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Trade Accounts Receivable (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Expected credit losses, beginning balance R$ 304,601 R$ 365,551 R$ 376,756
Additions/ (Reversals) 121,756 182,241 127,896
Write offs (154,414) [1] (243,302) (136,603)
Expected credit losses, ending balance 271,943 304,601 365,551
Others 23,863 [2] 111 [3] (2,498) [3]
Customers [Member]      
IfrsStatementLineItems [Line Items]      
Expected credit losses, beginning balance 155,288 213,096 218,989
Additions/ (Reversals) 126,045 180,586 123,657
Write offs (149,263) [1] (238,394) (129,550)
Expected credit losses, ending balance 132,070 155,288 213,096
Concessionaires And Permission Holder [Member]      
IfrsStatementLineItems [Line Items]      
Expected credit losses, beginning balance 139,428 140,198 140,090
Additions/ (Reversals) (5,353) 1,224 392
Write offs (4,583) [1] (1,994) (284)
Expected credit losses, ending balance 129,492 139,428 140,198
Telecommunications [Member]      
IfrsStatementLineItems [Line Items]      
Expected credit losses, beginning balance 5,149
Additions/ (Reversals)   3,042 3,609
Write offs   (3,153) (6,260)
Expected credit losses, ending balance
Others [3]   111 (2,498)
Gas distribution [member]      
IfrsStatementLineItems [Line Items]      
Expected credit losses, beginning balance 9,885 12,257 12,528
Additions/ (Reversals) 1,064 (2,611) 238
Write offs (568) [1] 239 (509)
Expected credit losses, ending balance 10,381 9,885 12,257
Residential [Member] | Customers [Member]      
IfrsStatementLineItems [Line Items]      
Expected credit losses, beginning balance 50,268 47,396 41,824
Additions/ (Reversals) 112,457 117,928 65,937
Write offs (100,199) [1] (115,056) (60,365)
Expected credit losses, ending balance 62,526 50,268 47,396
Industrial [Member] | Customers [Member]      
IfrsStatementLineItems [Line Items]      
Expected credit losses, beginning balance 42,431 88,866 97,954
Additions/ (Reversals) (12,993) 20,413 22,487
Write offs 3,398 [1] (66,848) (31,575)
Expected credit losses, ending balance 32,836 42,431 88,866
Commercial [Member] | Customers [Member]      
IfrsStatementLineItems [Line Items]      
Expected credit losses, beginning balance 58,294 68,723 70,925
Additions/ (Reversals) 22,510 35,628 29,092
Write offs (48,764) [1] (46,057) (31,294)
Expected credit losses, ending balance 32,040 58,294 68,723
Rural [Member] | Customers [Member]      
IfrsStatementLineItems [Line Items]      
Expected credit losses, beginning balance 2,960 3,937 3,389
Additions/ (Reversals) 4,327 6,407 4,788
Write offs (3,460) [1] (7,384) (4,240)
Expected credit losses, ending balance 3,827 2,960 3,937
Public Entities [Member] | Customers [Member]      
IfrsStatementLineItems [Line Items]      
Expected credit losses, beginning balance 381 3,084 4,890
Additions/ (Reversals) 116 184 9
Write offs 39 [1] (2,887) (1,815)
Expected credit losses, ending balance 536 381 3,084
Public Lighting [Member] | Customers [Member]      
IfrsStatementLineItems [Line Items]      
Expected credit losses, beginning balance 11 8 3
Additions/ (Reversals) 7 11 20
Write offs   (8) (15)
Expected credit losses, ending balance 18 11 8
Public Service [Member] | Customers [Member]      
IfrsStatementLineItems [Line Items]      
Expected credit losses, beginning balance (27) 143 265
Additions/ (Reversals) 2,254 (16) 124
Write offs (277) [1] (154) (246)
Expected credit losses, ending balance 1,950 (27) 143
Unbilled [Member] | Customers [Member]      
IfrsStatementLineItems [Line Items]      
Expected credit losses, beginning balance 2,474 1,589 1,180
Additions/ (Reversals) (1,487) 885 409
Expected credit losses, ending balance 987 2,474 1,589
Adjustment To Present Value [Member] | Customers [Member]      
IfrsStatementLineItems [Line Items]      
Expected credit losses, beginning balance (1,504) (650) (1,441)
Additions/ (Reversals) (1,146) (854) 791
Expected credit losses, ending balance (2,650) (1,504) (650)
C C E E [Member] | Concessionaires And Permission Holder [Member]      
IfrsStatementLineItems [Line Items]      
Expected credit losses, beginning balance 119,665 119,665 119,665
Additions/ (Reversals)
Expected credit losses, ending balance 119,665 119,665 119,665
Concessionaires And Permission Holders [Member] | Concessionaires And Permission Holder [Member]      
IfrsStatementLineItems [Line Items]      
Expected credit losses, beginning balance 19,763 20,533 20,425
Additions/ (Reversals) (5,353) 1,224 392
Write offs (4,583) [1] (1,994) (284)
Expected credit losses, ending balance R$ 9,827 R$ 19,763 R$ 20,533
[1] Net losses from recovered invoice balances.
[2] Reclassification to Assets classified as held for sale (Note 39) and effect of business combination.
[3] Reclassification to Assets classified as held for sale (Note 39).